Allows sites to easily move away from the WP User Avatar plugin and switch to WP User Avatars instead.

migrate-wp-user-avatar.php

<?php
/*
Migrate from WP User Avatar to WP User Avatars

Allows sites to easily move away from the WP User Avatar plugin and switch to WP User Avatars instead.

Run by invoking with WP CLI like so:
	`wp eval-file migrate-wp-user-avatar.php`

Author: Ulrich Pogson

Adapted from: https://gist.github.com/philipjohn/822d3521a95481f6ad7e118a7106fbc7

License: GPLv2
*/

// Get the name of the meta key for WP User Avatar.
global $wpdb;
$meta_key = $wpdb->get_blog_prefix() . 'user_avatar';

// Grab all users that have a local avatar.
$users = get_users(
	[
		'meta_key'     => $meta_key,
		'meta_compare' => 'EXISTS',
	]
);

foreach ( $users as $user ) {
	// Get the existing avatar media ID.
	$media_id = get_user_meta( $user->ID, $meta_key, true );

	if ( ! $media_id ) {
		continue;
	}

	wp_user_avatars_update_avatar( $user->ID, (int) $media_id );

	// Check that worked.
	$sla_done = get_user_meta( $user->ID, 'wp_user_avatars', true );
	if ( ! empty( $sla_done ) ) {
		// Remove the old WP User Avatar meta data.
		delete_user_meta( $user->ID, $meta_key );
	}
}